what causes landslides

Copyright 10. These are basically the human activities like construction of roads, buildings, dams, etc. Two nick points observed in the river are near the village of Jumma and 3 km downstream of village of Malari. Ria type coasts are kind of a tourist attraction.'. Duchess is accused copying almost word for word her comparison of social media... Vape use falls by 400,000 in 12 months - as unfounded health fears scare people from using e-cigs to quit... Mormon missionary from Utah, 20, dies after slipping and falling during a hike while serving in Switzerland. This effect can occur in the form of intense rainfall, snowmelt, changes in ground-water levels, and waterlevel changes along coastlines, earth dams, and the banks of lakes, reservoirs, canals, and rivers. Updated . It was, however, only after the Indo-China war of 1962 that the road construction was intensified in the Himalayas. A total of four hot springs are reported from the Chamoli sector of the reserve (Plate 7.1) indicating geological vulnerability of the reserve. About 50 km of road were further added to the existing network of roads in 2000. Report a Violation, Landslides in the Himalayas and its Features, Landslides and Its Influences on Biodiversity. Slope saturation by water is a primary cause of landslides. Historical trend of major landslides in reserve has been constructed on the basis of literature and field survey. This category has three major triggering mechanisms that can occur either singly or in combination —(1) water, (2) seismic activity, and (3) volcanic activity. Landslides can happen when heavy rain or floods weaken the ground by saturating soil with water. Landslides and flooding are closely associated because both are related to precipitation, runoff, and the saturation of ground by water. Your email address will not be published. Content Filtrations 6. ABOUT THE AUTHOR(S) Science Buddies. This activity brought to you in partnership with Science Buddies. All the above-stated factors state that the region has fragile geology and experienced rejuvenation in past. This deluge is capable of causing a great deal of damage downriver. Populations expanding onto new land and creating neighborhoods, towns, and cities is the primary means by which humans contribute to the occurrence of landslides. Landslides: What Causes a Hill to Become Creep-y?, from Science Buddies . The correlation between construction of roads and landslides is positive (Figure 7.2). This effect can occur in the form of intense rainfall, snowmelt, changes in groundwater levels, and water level changes along coastlines, earth dams, and the banks of lakes, reservoirs, canals, and rivers. During field survey, about 40 landslides were noticed in the reserve (Figure 7.5). Image Guidelines 5. Thus, excessive rainfall in the first half of monsoon saturates the bedrock and in latter half removes it in the form of landslides. Road construction and rainfall have increased in the reserve thus landslides have also become very frequent. Landslides due to volcanic activity represent some of the most devastating types of failures. Road construction has been the prime cause of landslides in the region. Thus, steady-state condition has disabled in many areas, which have eventually resulted in increased frequency of landslides. Excessive rainfall, triggering events and fragile geology wherever are found result in landslides. Therefore, landslides can be said nature’s rule of equilibrium. This category has three major triggering mechanisms that can occur either singly or in combination —(1) water, (2) seismic activity, and (3) volcanic activity. The loosened ground can come apart and send masses of land careering down hills or cliff-edges. Dhauli Ganga has the most tortuous course than any other river of the region. Any time plate tectonics move the soil that covers them moves with it. It has the three stage relations. Landslides also can cause tsunamis (seiches), overtopping of reservoirs, and (or) reduced capacity of reservoirs to store water. Figure 1 shows a devastating landslide caused by rainfall, and possibly made worse by a leaking water pipe, which added even more water to the soil. Of the total landslides, about 31 were human-induced and 9 were natural. Landslides occur when the slope (or a portion of it) undergoes some processes that change its condition from stable to unstable. Steep wildfire-burned slopes often are landslide-prone due to a combination of the burning and resultant denudation of vegetation on slopes, a change in soil chemistry due to burning, and a subsequent saturation of slopes by water from various sources, such as rainfall. Slope saturation by water is a primary cause of landslides. More frequent near-zero events along with more heavy rainfall might trigger a larger number of rockfalls and rock slides due to decreased rock stability.'. Disturbing or changing drainage patterns, destabilizing slopes, and removing vegetation are common human-induced factors that may initiate landslides. He added: 'Another fact is the geomorphology of the coast and its V-shape structure. Volcanic lava may melt snow rapidly, which can form a deluge of rock, soil, ash, and water that accelerates rapidly on the steep slopes of volcanoes, devastating anything in its path. A very interesting fact can be seen that almost all the landslides which are documented are natural (Table 7.1). River gradient is steep from Lambagad up to Govind Ghat then again slopes lose their steepness. Presently, intensity of landslide occurrence is high in NDBR as about 87 per cent of the respondents indicated the same, whereas only 13 per cent indicated moderate, low and very low intensity (Figure 7.6). Figure 3 shows a collapse of the side of a volcano and the resulting devastation. Most of the region is located in the peri-glacial and glacial environment. So, ideally, there should be much snowfall rather than rainfall. Determining Numerical Dates for Sedimentary Strata, Divergent Plate Boundaries and Seafloor Spreading, Understanding mudslides and other debris flows through mathematics - Geology Engineering, Preventing Landslides Geology engineering, Translation Slides along Bedding Planes - Geology engineering. Privacy Policy 8. Landslides occur when masses of rock, earth, or debris move down a slope. There are three sudden falls in the Dhauli Ganga River between the villages of Malari and Tapoban. It provides a fertile ground for landslide occurrence. Strong positive correlation between occurrence of landslides and construction of roads were observed during the field investiga­tions. It has also led to defores­tation in the reserve. Before publishing your articles on this site, please read the following pages: 1. About 83.5 per cent, 88 per cent, and 88.5 per cent of the respondents reported road construction, excessive rainfall and seismicity respectively as the most common causes of landslide occur­rence in the reserve. Slopes of geologically active NDBR are made up of complicated geo-structural and topographic set-up. The fall (nick point), which is about 6 miles above the village of Tapoban, is the maximum. About 80 per cent of the total landslides occurring now in the reserve are a result of road construction. What causes landslides in Norway? Survey results show that the landslides have been increasing rapidly in region since last three decades, as about 51 per cent of the respondents reported the same, while 33 per cent reported that landslides are increasing slowly and only 16 per cent stated that trend of landslide is almost static (Figure 7.4). A total of 10 major landslides have been noticed in literature. Rockfalls and rock topples can also be caused by loosening of rocks or rocky formations as a result of earthquake ground shaking. Landslides can happen when heavy rain or floods weaken the ground by saturating soil with water. It added: 'Near-zero (freeze-thaw) events have become more frequent in most non-coastal parts of the country, especially in cold areas. This can be attributed to global warming due to which rainfall regions are shifting upwards and taking place of snowfall in the reserve.

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